Maybe I could have explained more clearly (at 15:15 on 06 April 26, page 8).
Unlike in Christianity, in Islam salvation depends on someone’s good deeds outweighing their bad deeds, and even then it’s not certain.
In Christianity your good deeds don’t have to outweigh your bad deeds. If you trust and follow Jesus, all the bad things you have done are forgiven at once. Then you obey him as well as you can, not to gain salvation, but out of love and gratitude. You will still sin, but you confess and are forgiven as you go along.
//For it is by grace you have been saved, through faith– and this is not from yourselves, it is the gift of God– not by works [what you do], so that no one can boast.//
- Ephesians 2.8-9
In Christianity salvation is guaranteed:
//And this is the testimony: God has given us [Christians] eternal life, and this life is in his Son. Whoever has the Son has life; whoever does not have the Son of God does not have life.//
- 1 John 5.11-12
A young Muslim who has led a particularly bad life can never be confident of salvation, even if he lived perfectly from then on. His only guaranteed path to salvation is dying in the cause of Allah (in jihad).